linux-hardening - Re: [PATCH v2] drm/etnaviv: refactor deprecated strncpy

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Date: Sat, 23 Sep 2023 19:53:41 -0700
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Lucas Stach <l.stach@...gutronix.de>,
	Russell King <linux+etnaviv@...linux.org.uk>,
	Christian Gmeiner <christian.gmeiner@...il.com>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	Bo YU <tsu.yubo@...il.com>
Subject: Re: [PATCH v2] drm/etnaviv: refactor deprecated strncpy

On Mon, Sep 18, 2023 at 01:34:08PM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> We should prefer more robust and less ambiguous string interfaces.
> 
> A suitable replacement is `strscpy_pad` due to the fact that it
> guarantees NUL-termination on the destination buffer whilst maintaining
> the NUL-padding behavior that strncpy provides.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Cc: Bo YU <tsu.yubo@...il.com>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Looks good to me now. Thanks!

Reviewed-by: Kees Cook <keescook@...omium.org>

(Though again if you need a v3, making the Subject more specific would
be nice, "...: Replace strncpy with strscpy_pad"

-Kees

-- 
Kees Cook